Clive Gifford & Marc-Etienne Peintre
History is full of unusual colours to discover — gamboge (yellow), orchil (purple) and woad (blue). Yellow ochre preserved artworks in caves. Scheele’s green, containing arsenic, was used to colour fabric and sweets. Purple was made from thousands of sea snails until a chemist discovered a new way to make it while trying to cure malaria. Colourful and fun.